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A. 3x² + 5x + 7y + 5y + 2x - 5
=> 3x² + 9x + 12y - 5
B. 5x² - 7x + 5 + (3x² - 4x - 5)
=> 5x² + 3x² - 7x - 4x + 5 - 5
=> 8x² - 11x = x(8x - 11)
C. 5x - 7x² - (21 - 4x + 3x²) + 5
=> -7x² - 3x² + 5x + 4x - 21 + 5
=> -10x² + 9x - 16
2.)
A. (2x)x(5x²y)
=> 2x²(5x²y) = 10x⁴y
B. -3x²y(5x + 3y)
=> -15x³y - 9x²y²
C. -5x(x² + 3) + (7x²)(3xy)
=> -5x³ - 15x + 21x³y